Replacement adhesive for inner panel to hood blobs?
 

I recently found a really nice Trans Am hood for my '75 Bird. It appears to have been media blasted on the underside. The metal is pristine but the blobs of adhesive that are supposed to support the space between the internal bracing and the outer skin are missing in a lot of spots now. Someone had tried using cheapo, hardware store, spray-foam insulation and that is just useless. I have scraped most of it away.

Anyone have any suggestions on what type of adhesive could be used to inject into the spots again to remake the supporting "blobs" that should be there? It needs to be something that keeps its form while hardening and stays in that one spot.

steve, go to a auto body supply store, they will have this specialized product. It is a liquid expanding dampening foam, same as oem on new cars today.

This stuff? 8463 3M

https://www.3m.com/3M/en_US/company-...3193646&rt=rud

The other formula (8458) they make is a rigid design for door pillars and other internal applications.

https://www.3m.com/3M/en_US/company-...3194025&rt=rud

Added problem is that you have to buy their applicator gun and tips...more money!

Lord Fusor 121 fast set expanding foam

The old original stuff is rock hard, not a foam.

I have used seam sealer a few times and it worked well.

Mike

----Yup, Mike. The one thing you definetly wouldn't want would be anything that expanded as it cured. Would put a lump on the other side of the hood........Bill S

And seam sealer does not get rock hard. Carry on.

Mike

I’ve reskined a few hoods and prefer to use panel bond adhesive. Two part epoxy which does not expand. It is amazing how stiff the hoods turn out compared to the originals which have begun separating.

I use windshield urethane sets up nice.

I thought if the panels were bonded tight the skin would not float with temp change which may cause it to show flex/wave at the adhesion points ?

3m Urethane seam sealer part number 08361.

IT EXPANDS 10 TIMES SIZE, NOT PRESSURE EXPANSIVE. IT IS DESIGNED FOR THIS. ONE DROP ABOUT THE SIZE OF A PEA WILL EXPAND TO ABOUT THE SIZE YOU WANT. IT WILL TOUCH THE HOOD SKIN, THEN EXPANDS OUT. IT IS NOT EVEN IN THE SAME UNIVERSE AS GREAT STUFF.
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Lord Fusor 121 Flexible Foam (Super Fast)


Lord Fusor Flexible Foam (Super Fast)


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Lord Fusor Flexible Foam (Super Fast)

Applications

Sound deadening, sealing and filling of: door skins to crash bar, hood panel to supports, trunk panel to supports and gas tank filler area.

Substrates

Primed or painted metals and all plastics.

Features & Benefits

Matches OEM sound deadening foams
Retains its memory with no shrinkage
Expands to 10 times its size
Will not oil can
Will not absorb moisture or cause corrosion
Available in 50 mL or 300 mL cartridges

Product Usage Instructions

MSDS Part A